/Engine/Source/Runtime/Interchange/Engine/Public/InterchangeMeshUtilities.h
MeshObject - The Mesh we want to add the lod  LodIndex - The index of the LOD we want to replace or add  - return true if it successfully add or replace the MeshObject LOD at LodIndex with the imported data.
static [TFuture](API\Runtime\Core\Async\TFuture)< bool > ImportCustomLodAsync ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * MeshObject, const int32 LodIndex )